src/libinput.c

   1 /*
   2  * Copyright © 2013 Jonas Ådahl
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of the copyright holders not be used in
   9  * advertising or publicity pertaining to distribution of the software
  10  * without specific, written prior permission.  The copyright holders make
  11  * no representations about the suitability of this software for any
  12  * purpose.  It is provided "as is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  15  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  16  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  17  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  18  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  19  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  20  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  */
  22
  23 #include "config.h"
  24
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/epoll.h>
  30 #include <unistd.h>
  31 #include <assert.h>
  32
  33 #include "libinput.h"
  34 #include "libinput-private.h"
  35 #include "evdev.h"
  36
  37 struct libinput_source {
  38         libinput_source_dispatch_t dispatch;
  39         void *user_data;
  40         int fd;
  41         struct list link;
  42 };
  43
  44 struct libinput_event {
  45         enum libinput_event_type type;
  46         struct libinput_device *device;
  47 };
  48
  49 struct libinput_event_device_notify {
  50         struct libinput_event base;
  51 };
  52
  53 struct libinput_event_keyboard {
  54         struct libinput_event base;
  55         uint32_t time;
  56         uint32_t key;
  57         uint32_t seat_key_count;
  58         enum libinput_keyboard_key_state state;
  59 };
  60
  61 struct libinput_event_pointer {
  62         struct libinput_event base;
  63         uint32_t time;
  64         li_fixed_t x;
  65         li_fixed_t y;
  66         uint32_t button;
  67         uint32_t seat_button_count;
  68         enum libinput_pointer_button_state state;
  69         enum libinput_pointer_axis axis;
  70         li_fixed_t value;
  71 };
  72
  73 struct libinput_event_touch {
  74         struct libinput_event base;
  75         uint32_t time;
  76         int32_t slot;
  77         int32_t seat_slot;
  78         li_fixed_t x;
  79         li_fixed_t y;
  80 };
  81
  82 static void
  83 libinput_default_log_func(enum libinput_log_priority priority,
  84                           void *data,
  85                           const char *format, va_list args)
  86 {
  87         const char *prefix;
  88
  89         switch(priority) {
  90         case LIBINPUT_LOG_PRIORITY_DEBUG: prefix = "debug"; break;
  91         case LIBINPUT_LOG_PRIORITY_INFO: prefix = "info"; break;
  92         case LIBINPUT_LOG_PRIORITY_ERROR: prefix = "error"; break;
  93         default: prefix="<invalid priority>"; break;
  94         }
  95
  96         fprintf(stderr, "libinput %s: ", prefix);
  97         vfprintf(stderr, format, args);
  98 }
  99
 100 struct log_data {
 101         enum libinput_log_priority priority;
 102         libinput_log_handler handler;
 103         void *user_data;
 104 };
 105
 106 static struct log_data log_data = {
 107         .priority = LIBINPUT_LOG_PRIORITY_ERROR,
 108         .handler = libinput_default_log_func,
 109         .user_data = NULL,
 110 };
 111
 112 void
 113 log_msg(enum libinput_log_priority priority, const char *format, ...)
 114 {
 115         va_list args;
 116
 117         if (log_data.handler && log_data.priority <= priority) {
 118                 va_start(args, format);
 119                 log_data.handler(priority, log_data.user_data, format, args);
 120                 va_end(args);
 121         }
 122 }
 123
 124 LIBINPUT_EXPORT void
 125 libinput_log_set_priority(enum libinput_log_priority priority)
 126 {
 127         log_data.priority = priority;
 128 }
 129
 130 LIBINPUT_EXPORT enum libinput_log_priority
 131 libinput_log_get_priority(void)
 132 {
 133         return log_data.priority;
 134 }
 135
 136 LIBINPUT_EXPORT void
 137 libinput_log_set_handler(libinput_log_handler log_handler,
 138                          void *user_data)
 139 {
 140         log_data.handler = log_handler;
 141         log_data.user_data = user_data;
 142 }
 143
 144 static void
 145 libinput_post_event(struct libinput *libinput,
 146                     struct libinput_event *event);
 147
 148 LIBINPUT_EXPORT enum libinput_event_type
 149 libinput_event_get_type(struct libinput_event *event)
 150 {
 151         return event->type;
 152 }
 153
 154 LIBINPUT_EXPORT struct libinput *
 155 libinput_event_get_context(struct libinput_event *event)
 156 {
 157         return event->device->seat->libinput;
 158 }
 159
 160 LIBINPUT_EXPORT struct libinput_device *
 161 libinput_event_get_device(struct libinput_event *event)
 162 {
 163         return event->device;
 164 }
 165
 166 LIBINPUT_EXPORT struct libinput_event_pointer *
 167 libinput_event_get_pointer_event(struct libinput_event *event)
 168 {
 169         switch (event->type) {
 170         case LIBINPUT_EVENT_NONE:
 171                 abort(); /* not used as actual event type */
 172         case LIBINPUT_EVENT_DEVICE_ADDED:
 173         case LIBINPUT_EVENT_DEVICE_REMOVED:
 174         case LIBINPUT_EVENT_KEYBOARD_KEY:
 175                 break;
 176         case LIBINPUT_EVENT_POINTER_MOTION:
 177         case LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE:
 178         case LIBINPUT_EVENT_POINTER_BUTTON:
 179         case LIBINPUT_EVENT_POINTER_AXIS:
 180                 return (struct libinput_event_pointer *) event;
 181         case LIBINPUT_EVENT_TOUCH_DOWN:
 182         case LIBINPUT_EVENT_TOUCH_UP:
 183         case LIBINPUT_EVENT_TOUCH_MOTION:
 184         case LIBINPUT_EVENT_TOUCH_CANCEL:
 185         case LIBINPUT_EVENT_TOUCH_FRAME:
 186                 break;
 187         }
 188
 189         return NULL;
 190 }
 191
 192 LIBINPUT_EXPORT struct libinput_event_keyboard *
 193 libinput_event_get_keyboard_event(struct libinput_event *event)
 194 {
 195         switch (event->type) {
 196         case LIBINPUT_EVENT_NONE:
 197                 abort(); /* not used as actual event type */
 198         case LIBINPUT_EVENT_DEVICE_ADDED:
 199         case LIBINPUT_EVENT_DEVICE_REMOVED:
 200                 break;
 201         case LIBINPUT_EVENT_KEYBOARD_KEY:
 202                 return (struct libinput_event_keyboard *) event;
 203         case LIBINPUT_EVENT_POINTER_MOTION:
 204         case LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE:
 205         case LIBINPUT_EVENT_POINTER_BUTTON:
 206         case LIBINPUT_EVENT_POINTER_AXIS:
 207         case LIBINPUT_EVENT_TOUCH_DOWN:
 208         case LIBINPUT_EVENT_TOUCH_UP:
 209         case LIBINPUT_EVENT_TOUCH_MOTION:
 210         case LIBINPUT_EVENT_TOUCH_CANCEL:
 211         case LIBINPUT_EVENT_TOUCH_FRAME:
 212                 break;
 213         }
 214
 215         return NULL;
 216 }
 217
 218 LIBINPUT_EXPORT struct libinput_event_touch *
 219 libinput_event_get_touch_event(struct libinput_event *event)
 220 {
 221         switch (event->type) {
 222         case LIBINPUT_EVENT_NONE:
 223                 abort(); /* not used as actual event type */
 224         case LIBINPUT_EVENT_DEVICE_ADDED:
 225         case LIBINPUT_EVENT_DEVICE_REMOVED:
 226         case LIBINPUT_EVENT_KEYBOARD_KEY:
 227         case LIBINPUT_EVENT_POINTER_MOTION:
 228         case LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE:
 229         case LIBINPUT_EVENT_POINTER_BUTTON:
 230         case LIBINPUT_EVENT_POINTER_AXIS:
 231                 break;
 232         case LIBINPUT_EVENT_TOUCH_DOWN:
 233         case LIBINPUT_EVENT_TOUCH_UP:
 234         case LIBINPUT_EVENT_TOUCH_MOTION:
 235         case LIBINPUT_EVENT_TOUCH_CANCEL:
 236         case LIBINPUT_EVENT_TOUCH_FRAME:
 237                 return (struct libinput_event_touch *) event;
 238         }
 239
 240         return NULL;
 241 }
 242
 243 LIBINPUT_EXPORT struct libinput_event_device_notify *
 244 libinput_event_get_device_notify_event(struct libinput_event *event)
 245 {
 246         switch (event->type) {
 247         case LIBINPUT_EVENT_NONE:
 248                 abort(); /* not used as actual event type */
 249         case LIBINPUT_EVENT_DEVICE_ADDED:
 250         case LIBINPUT_EVENT_DEVICE_REMOVED:
 251                 return (struct libinput_event_device_notify *) event;
 252         case LIBINPUT_EVENT_KEYBOARD_KEY:
 253         case LIBINPUT_EVENT_POINTER_MOTION:
 254         case LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE:
 255         case LIBINPUT_EVENT_POINTER_BUTTON:
 256         case LIBINPUT_EVENT_POINTER_AXIS:
 257         case LIBINPUT_EVENT_TOUCH_DOWN:
 258         case LIBINPUT_EVENT_TOUCH_UP:
 259         case LIBINPUT_EVENT_TOUCH_MOTION:
 260         case LIBINPUT_EVENT_TOUCH_CANCEL:
 261         case LIBINPUT_EVENT_TOUCH_FRAME:
 262                 break;
 263         }
 264
 265         return NULL;
 266 }
 267
 268 LIBINPUT_EXPORT uint32_t
 269 libinput_event_keyboard_get_time(struct libinput_event_keyboard *event)
 270 {
 271         return event->time;
 272 }
 273
 274 LIBINPUT_EXPORT uint32_t
 275 libinput_event_keyboard_get_key(struct libinput_event_keyboard *event)
 276 {
 277         return event->key;
 278 }
 279
 280 LIBINPUT_EXPORT enum libinput_keyboard_key_state
 281 libinput_event_keyboard_get_key_state(struct libinput_event_keyboard *event)
 282 {
 283         return event->state;
 284 }
 285
 286 LIBINPUT_EXPORT uint32_t
 287 libinput_event_keyboard_get_seat_key_count(
 288         struct libinput_event_keyboard *event)
 289 {
 290         return event->seat_key_count;
 291 }
 292
 293 LIBINPUT_EXPORT uint32_t
 294 libinput_event_pointer_get_time(struct libinput_event_pointer *event)
 295 {
 296         return event->time;
 297 }
 298
 299 LIBINPUT_EXPORT li_fixed_t
 300 libinput_event_pointer_get_dx(struct libinput_event_pointer *event)
 301 {
 302         return event->x;
 303 }
 304
 305 LIBINPUT_EXPORT li_fixed_t
 306 libinput_event_pointer_get_dy(struct libinput_event_pointer *event)
 307 {
 308         return event->y;
 309 }
 310
 311 LIBINPUT_EXPORT li_fixed_t
 312 libinput_event_pointer_get_absolute_x(struct libinput_event_pointer *event)
 313 {
 314         return event->x;
 315 }
 316
 317 LIBINPUT_EXPORT li_fixed_t
 318 libinput_event_pointer_get_absolute_y(struct libinput_event_pointer *event)
 319 {
 320         return event->y;
 321 }
 322
 323 LIBINPUT_EXPORT li_fixed_t
 324 libinput_event_pointer_get_absolute_x_transformed(
 325         struct libinput_event_pointer *event,
 326         uint32_t width)
 327 {
 328         struct evdev_device *device =
 329                 (struct evdev_device *) event->base.device;
 330
 331         return evdev_device_transform_x(device, event->x, width);
 332 }
 333
 334 LIBINPUT_EXPORT li_fixed_t
 335 libinput_event_pointer_get_absolute_y_transformed(
 336         struct libinput_event_pointer *event,
 337         uint32_t height)
 338 {
 339         struct evdev_device *device =
 340                 (struct evdev_device *) event->base.device;
 341
 342         return evdev_device_transform_y(device, event->y, height);
 343 }
 344
 345 LIBINPUT_EXPORT uint32_t
 346 libinput_event_pointer_get_button(struct libinput_event_pointer *event)
 347 {
 348         return event->button;
 349 }
 350
 351 LIBINPUT_EXPORT enum libinput_pointer_button_state
 352 libinput_event_pointer_get_button_state(struct libinput_event_pointer *event)
 353 {
 354         return event->state;
 355 }
 356
 357 LIBINPUT_EXPORT uint32_t
 358 libinput_event_pointer_get_seat_button_count(
 359         struct libinput_event_pointer *event)
 360 {
 361         return event->seat_button_count;
 362 }
 363
 364 LIBINPUT_EXPORT enum libinput_pointer_axis
 365 libinput_event_pointer_get_axis(struct libinput_event_pointer *event)
 366 {
 367         return event->axis;
 368 }
 369
 370 LIBINPUT_EXPORT li_fixed_t
 371 libinput_event_pointer_get_axis_value(struct libinput_event_pointer *event)
 372 {
 373         return event->value;
 374 }
 375
 376 LIBINPUT_EXPORT uint32_t
 377 libinput_event_touch_get_time(struct libinput_event_touch *event)
 378 {
 379         return event->time;
 380 }
 381
 382 LIBINPUT_EXPORT int32_t
 383 libinput_event_touch_get_slot(struct libinput_event_touch *event)
 384 {
 385         return event->slot;
 386 }
 387
 388 LIBINPUT_EXPORT int32_t
 389 libinput_event_touch_get_seat_slot(struct libinput_event_touch *event)
 390 {
 391         return event->seat_slot;
 392 }
 393
 394 LIBINPUT_EXPORT li_fixed_t
 395 libinput_event_touch_get_x(struct libinput_event_touch *event)
 396 {
 397         return event->x;
 398 }
 399
 400 LIBINPUT_EXPORT li_fixed_t
 401 libinput_event_touch_get_x_transformed(struct libinput_event_touch *event,
 402                                        uint32_t width)
 403 {
 404         struct evdev_device *device =
 405                 (struct evdev_device *) event->base.device;
 406
 407         return evdev_device_transform_x(device, event->x, width);
 408 }
 409
 410 LIBINPUT_EXPORT li_fixed_t
 411 libinput_event_touch_get_y_transformed(struct libinput_event_touch *event,
 412                                        uint32_t height)
 413 {
 414         struct evdev_device *device =
 415                 (struct evdev_device *) event->base.device;
 416
 417         return evdev_device_transform_y(device, event->y, height);
 418 }
 419
 420 LIBINPUT_EXPORT li_fixed_t
 421 libinput_event_touch_get_y(struct libinput_event_touch *event)
 422 {
 423         return event->y;
 424 }
 425
 426 struct libinput_source *
 427 libinput_add_fd(struct libinput *libinput,
 428                 int fd,
 429                 libinput_source_dispatch_t dispatch,
 430                 void *user_data)
 431 {
 432         struct libinput_source *source;
 433         struct epoll_event ep;
 434
 435         source = malloc(sizeof *source);
 436         if (!source)
 437                 return NULL;
 438
 439         source->dispatch = dispatch;
 440         source->user_data = user_data;
 441         source->fd = fd;
 442
 443         memset(&ep, 0, sizeof ep);
 444         ep.events = EPOLLIN;
 445         ep.data.ptr = source;
 446
 447         if (epoll_ctl(libinput->epoll_fd, EPOLL_CTL_ADD, fd, &ep) < 0) {
 448                 close(source->fd);
 449                 free(source);
 450                 return NULL;
 451         }
 452
 453         return source;
 454 }
 455
 456 void
 457 libinput_remove_source(struct libinput *libinput,
 458                        struct libinput_source *source)
 459 {
 460         epoll_ctl(libinput->epoll_fd, EPOLL_CTL_DEL, source->fd, NULL);
 461         source->fd = -1;
 462         list_insert(&libinput->source_destroy_list, &source->link);
 463 }
 464
 465 int
 466 libinput_init(struct libinput *libinput,
 467               const struct libinput_interface *interface,
 468               const struct libinput_interface_backend *interface_backend,
 469               void *user_data)
 470 {
 471         libinput->epoll_fd = epoll_create1(EPOLL_CLOEXEC);;
 472         if (libinput->epoll_fd < 0)
 473                 return -1;
 474
 475         libinput->events_len = 4;
 476         libinput->events = zalloc(libinput->events_len * sizeof(*libinput->events));
 477         if (!libinput->events) {
 478                 close(libinput->epoll_fd);
 479                 return -1;
 480         }
 481
 482         libinput->interface = interface;
 483         libinput->interface_backend = interface_backend;
 484         libinput->user_data = user_data;
 485         list_init(&libinput->source_destroy_list);
 486         list_init(&libinput->seat_list);
 487
 488         return 0;
 489 }
 490
 491 static void
 492 libinput_device_destroy(struct libinput_device *device);
 493
 494 static void
 495 libinput_seat_destroy(struct libinput_seat *seat);
 496
 497 static void
 498 libinput_drop_destroyed_sources(struct libinput *libinput)
 499 {
 500         struct libinput_source *source, *next;
 501
 502         list_for_each_safe(source, next, &libinput->source_destroy_list, link)
 503                 free(source);
 504         list_init(&libinput->source_destroy_list);
 505 }
 506
 507 LIBINPUT_EXPORT void
 508 libinput_destroy(struct libinput *libinput)
 509 {
 510         struct libinput_event *event;
 511         struct libinput_device *device, *next_device;
 512         struct libinput_seat *seat, *next_seat;
 513
 514         if (libinput == NULL)
 515                 return;
 516
 517         libinput_suspend(libinput);
 518
 519         libinput->interface_backend->destroy(libinput);
 520
 521         while ((event = libinput_get_event(libinput)))
 522                libinput_event_destroy(event);
 523
 524         libinput_drop_destroyed_sources(libinput);
 525
 526         free(libinput->events);
 527
 528         list_for_each_safe(seat, next_seat, &libinput->seat_list, link) {
 529                 list_for_each_safe(device, next_device,
 530                                    &seat->devices_list,
 531                                    link)
 532                         libinput_device_destroy(device);
 533
 534                 libinput_seat_destroy(seat);
 535         }
 536
 537         close(libinput->epoll_fd);
 538         free(libinput);
 539 }
 540
 541 LIBINPUT_EXPORT void
 542 libinput_event_destroy(struct libinput_event *event)
 543 {
 544         if (event == NULL)
 545                 return;
 546
 547         if (event->device)
 548                 libinput_device_unref(event->device);
 549
 550         free(event);
 551 }
 552
 553 int
 554 open_restricted(struct libinput *libinput,
 555                 const char *path, int flags)
 556 {
 557         return libinput->interface->open_restricted(path,
 558                                                     flags,
 559                                                     libinput->user_data);
 560 }
 561
 562 void
 563 close_restricted(struct libinput *libinput, int fd)
 564 {
 565         return libinput->interface->close_restricted(fd, libinput->user_data);
 566 }
 567
 568 void
 569 libinput_seat_init(struct libinput_seat *seat,
 570                    struct libinput *libinput,
 571                    const char *physical_name,
 572                    const char *logical_name,
 573                    libinput_seat_destroy_func destroy)
 574 {
 575         seat->refcount = 1;
 576         seat->libinput = libinput;
 577         seat->physical_name = strdup(physical_name);
 578         seat->logical_name = strdup(logical_name);
 579         seat->destroy = destroy;
 580         list_init(&seat->devices_list);
 581         list_insert(&libinput->seat_list, &seat->link);
 582 }
 583
 584 LIBINPUT_EXPORT void
 585 libinput_seat_ref(struct libinput_seat *seat)
 586 {
 587         seat->refcount++;
 588 }
 589
 590 static void
 591 libinput_seat_destroy(struct libinput_seat *seat)
 592 {
 593         list_remove(&seat->link);
 594         free(seat->logical_name);
 595         free(seat->physical_name);
 596         seat->destroy(seat);
 597 }
 598
 599 LIBINPUT_EXPORT void
 600 libinput_seat_unref(struct libinput_seat *seat)
 601 {
 602         assert(seat->refcount > 0);
 603         seat->refcount--;
 604         if (seat->refcount == 0)
 605                 libinput_seat_destroy(seat);
 606 }
 607
 608 LIBINPUT_EXPORT void
 609 libinput_seat_set_user_data(struct libinput_seat *seat, void *user_data)
 610 {
 611         seat->user_data = user_data;
 612 }
 613
 614 LIBINPUT_EXPORT void *
 615 libinput_seat_get_user_data(struct libinput_seat *seat)
 616 {
 617         return seat->user_data;
 618 }
 619
 620 LIBINPUT_EXPORT const char *
 621 libinput_seat_get_physical_name(struct libinput_seat *seat)
 622 {
 623         return seat->physical_name;
 624 }
 625
 626 LIBINPUT_EXPORT const char *
 627 libinput_seat_get_logical_name(struct libinput_seat *seat)
 628 {
 629         return seat->logical_name;
 630 }
 631
 632 void
 633 libinput_device_init(struct libinput_device *device,
 634                      struct libinput_seat *seat)
 635 {
 636         device->seat = seat;
 637         device->refcount = 1;
 638 }
 639
 640 LIBINPUT_EXPORT void
 641 libinput_device_ref(struct libinput_device *device)
 642 {
 643         device->refcount++;
 644 }
 645
 646 static void
 647 libinput_device_destroy(struct libinput_device *device)
 648 {
 649         evdev_device_destroy((struct evdev_device *) device);
 650 }
 651
 652 LIBINPUT_EXPORT void
 653 libinput_device_unref(struct libinput_device *device)
 654 {
 655         assert(device->refcount > 0);
 656         device->refcount--;
 657         if (device->refcount == 0)
 658                 libinput_device_destroy(device);
 659 }
 660
 661 LIBINPUT_EXPORT int
 662 libinput_get_fd(struct libinput *libinput)
 663 {
 664         return libinput->epoll_fd;
 665 }
 666
 667 LIBINPUT_EXPORT int
 668 libinput_dispatch(struct libinput *libinput)
 669 {
 670         struct libinput_source *source;
 671         struct epoll_event ep[32];
 672         int i, count;
 673
 674         count = epoll_wait(libinput->epoll_fd, ep, ARRAY_LENGTH(ep), 0);
 675         if (count < 0)
 676                 return -errno;
 677
 678         for (i = 0; i < count; ++i) {
 679                 source = ep[i].data.ptr;
 680                 if (source->fd == -1)
 681                         continue;
 682
 683                 source->dispatch(source->user_data);
 684         }
 685
 686         libinput_drop_destroyed_sources(libinput);
 687
 688         return 0;
 689 }
 690
 691 static uint32_t
 692 update_seat_key_count(struct libinput_seat *seat,
 693                       int32_t key,
 694                       enum libinput_keyboard_key_state state)
 695 {
 696         assert(key >= 0 && key <= KEY_MAX);
 697
 698         switch (state) {
 699         case LIBINPUT_KEYBOARD_KEY_STATE_PRESSED:
 700                 return ++seat->button_count[key];
 701         case LIBINPUT_KEYBOARD_KEY_STATE_RELEASED:
 702                 /* We might not have received the first PRESSED event. */
 703                 if (seat->button_count[key] == 0)
 704                         return 0;
 705
 706                 return --seat->button_count[key];
 707         }
 708
 709         return 0;
 710 }
 711
 712 static uint32_t
 713 update_seat_button_count(struct libinput_seat *seat,
 714                          int32_t button,
 715                          enum libinput_pointer_button_state state)
 716 {
 717         assert(button >= 0 && button <= KEY_MAX);
 718
 719         switch (state) {
 720         case LIBINPUT_POINTER_BUTTON_STATE_PRESSED:
 721                 return ++seat->button_count[button];
 722         case LIBINPUT_POINTER_BUTTON_STATE_RELEASED:
 723                 /* We might not have received the first PRESSED event. */
 724                 if (seat->button_count[button] == 0)
 725                         return 0;
 726
 727                 return --seat->button_count[button];
 728         }
 729
 730         return 0;
 731 }
 732
 733 static void
 734 init_event_base(struct libinput_event *event,
 735                 struct libinput_device *device,
 736                 enum libinput_event_type type)
 737 {
 738         event->type = type;
 739         event->device = device;
 740 }
 741
 742 static void
 743 post_base_event(struct libinput_device *device,
 744                 enum libinput_event_type type,
 745                 struct libinput_event *event)
 746 {
 747         struct libinput *libinput = device->seat->libinput;
 748         init_event_base(event, device, type);
 749         libinput_post_event(libinput, event);
 750 }
 751
 752 static void
 753 post_device_event(struct libinput_device *device,
 754                   enum libinput_event_type type,
 755                   struct libinput_event *event)
 756 {
 757         init_event_base(event, device, type);
 758         libinput_post_event(device->seat->libinput, event);
 759 }
 760
 761 void
 762 notify_added_device(struct libinput_device *device)
 763 {
 764         struct libinput_event_device_notify *added_device_event;
 765
 766         added_device_event = zalloc(sizeof *added_device_event);
 767         if (!added_device_event)
 768                 return;
 769
 770         post_base_event(device,
 771                         LIBINPUT_EVENT_DEVICE_ADDED,
 772                         &added_device_event->base);
 773 }
 774
 775 void
 776 notify_removed_device(struct libinput_device *device)
 777 {
 778         struct libinput_event_device_notify *removed_device_event;
 779
 780         removed_device_event = zalloc(sizeof *removed_device_event);
 781         if (!removed_device_event)
 782                 return;
 783
 784         post_base_event(device,
 785                         LIBINPUT_EVENT_DEVICE_REMOVED,
 786                         &removed_device_event->base);
 787 }
 788
 789 void
 790 keyboard_notify_key(struct libinput_device *device,
 791                     uint32_t time,
 792                     uint32_t key,
 793                     enum libinput_keyboard_key_state state)
 794 {
 795         struct libinput_event_keyboard *key_event;
 796         uint32_t seat_key_count;
 797
 798         key_event = zalloc(sizeof *key_event);
 799         if (!key_event)
 800                 return;
 801
 802         seat_key_count = update_seat_key_count(device->seat, key, state);
 803
 804         *key_event = (struct libinput_event_keyboard) {
 805                 .time = time,
 806                 .key = key,
 807                 .state = state,
 808                 .seat_key_count = seat_key_count,
 809         };
 810
 811         post_device_event(device,
 812                           LIBINPUT_EVENT_KEYBOARD_KEY,
 813                           &key_event->base);
 814 }
 815
 816 void
 817 pointer_notify_motion(struct libinput_device *device,
 818                       uint32_t time,
 819                       li_fixed_t dx,
 820                       li_fixed_t dy)
 821 {
 822         struct libinput_event_pointer *motion_event;
 823
 824         motion_event = zalloc(sizeof *motion_event);
 825         if (!motion_event)
 826                 return;
 827
 828         *motion_event = (struct libinput_event_pointer) {
 829                 .time = time,
 830                 .x = dx,
 831                 .y = dy,
 832         };
 833
 834         post_device_event(device,
 835                           LIBINPUT_EVENT_POINTER_MOTION,
 836                           &motion_event->base);
 837 }
 838
 839 void
 840 pointer_notify_motion_absolute(struct libinput_device *device,
 841                                uint32_t time,
 842                                li_fixed_t x,
 843                                li_fixed_t y)
 844 {
 845         struct libinput_event_pointer *motion_absolute_event;
 846
 847         motion_absolute_event = zalloc(sizeof *motion_absolute_event);
 848         if (!motion_absolute_event)
 849                 return;
 850
 851         *motion_absolute_event = (struct libinput_event_pointer) {
 852                 .time = time,
 853                 .x = x,
 854                 .y = y,
 855         };
 856
 857         post_device_event(device,
 858                           LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE,
 859                           &motion_absolute_event->base);
 860 }
 861
 862 void
 863 pointer_notify_button(struct libinput_device *device,
 864                       uint32_t time,
 865                       int32_t button,
 866                       enum libinput_pointer_button_state state)
 867 {
 868         struct libinput_event_pointer *button_event;
 869         int32_t seat_button_count;
 870
 871         button_event = zalloc(sizeof *button_event);
 872         if (!button_event)
 873                 return;
 874
 875         seat_button_count = update_seat_button_count(device->seat,
 876                                                      button,
 877                                                      state);
 878
 879         *button_event = (struct libinput_event_pointer) {
 880                 .time = time,
 881                 .button = button,
 882                 .state = state,
 883                 .seat_button_count = seat_button_count,
 884         };
 885
 886         post_device_event(device,
 887                           LIBINPUT_EVENT_POINTER_BUTTON,
 888                           &button_event->base);
 889 }
 890
 891 void
 892 pointer_notify_axis(struct libinput_device *device,
 893                     uint32_t time,
 894                     enum libinput_pointer_axis axis,
 895                     li_fixed_t value)
 896 {
 897         struct libinput_event_pointer *axis_event;
 898
 899         axis_event = zalloc(sizeof *axis_event);
 900         if (!axis_event)
 901                 return;
 902
 903         *axis_event = (struct libinput_event_pointer) {
 904                 .time = time,
 905                 .axis = axis,
 906                 .value = value,
 907         };
 908
 909         post_device_event(device,
 910                           LIBINPUT_EVENT_POINTER_AXIS,
 911                           &axis_event->base);
 912 }
 913
 914 void
 915 touch_notify_touch_down(struct libinput_device *device,
 916                         uint32_t time,
 917                         int32_t slot,
 918                         int32_t seat_slot,
 919                         li_fixed_t x,
 920                         li_fixed_t y)
 921 {
 922         struct libinput_event_touch *touch_event;
 923
 924         touch_event = zalloc(sizeof *touch_event);
 925         if (!touch_event)
 926                 return;
 927
 928         *touch_event = (struct libinput_event_touch) {
 929                 .time = time,
 930                 .slot = slot,
 931                 .seat_slot = seat_slot,
 932                 .x = x,
 933                 .y = y,
 934         };
 935
 936         post_device_event(device,
 937                           LIBINPUT_EVENT_TOUCH_DOWN,
 938                           &touch_event->base);
 939 }
 940
 941 void
 942 touch_notify_touch_motion(struct libinput_device *device,
 943                           uint32_t time,
 944                           int32_t slot,
 945                           int32_t seat_slot,
 946                           li_fixed_t x,
 947                           li_fixed_t y)
 948 {
 949         struct libinput_event_touch *touch_event;
 950
 951         touch_event = zalloc(sizeof *touch_event);
 952         if (!touch_event)
 953                 return;
 954
 955         *touch_event = (struct libinput_event_touch) {
 956                 .time = time,
 957                 .slot = slot,
 958                 .seat_slot = seat_slot,
 959                 .x = x,
 960                 .y = y,
 961         };
 962
 963         post_device_event(device,
 964                           LIBINPUT_EVENT_TOUCH_MOTION,
 965                           &touch_event->base);
 966 }
 967
 968 void
 969 touch_notify_touch_up(struct libinput_device *device,
 970                       uint32_t time,
 971                       int32_t slot,
 972                       int32_t seat_slot)
 973 {
 974         struct libinput_event_touch *touch_event;
 975
 976         touch_event = zalloc(sizeof *touch_event);
 977         if (!touch_event)
 978                 return;
 979
 980         *touch_event = (struct libinput_event_touch) {
 981                 .time = time,
 982                 .slot = slot,
 983                 .seat_slot = seat_slot,
 984         };
 985
 986         post_device_event(device,
 987                           LIBINPUT_EVENT_TOUCH_UP,
 988                           &touch_event->base);
 989 }
 990
 991 void
 992 touch_notify_frame(struct libinput_device *device,
 993                    uint32_t time)
 994 {
 995         struct libinput_event_touch *touch_event;
 996
 997         touch_event = zalloc(sizeof *touch_event);
 998         if (!touch_event)
 999                 return;
1000
1001         *touch_event = (struct libinput_event_touch) {
1002                 .time = time,
1003         };
1004
1005         post_device_event(device,
1006                           LIBINPUT_EVENT_TOUCH_FRAME,
1007                           &touch_event->base);
1008 }
1009
1010
1011 static void
1012 libinput_post_event(struct libinput *libinput,
1013                     struct libinput_event *event)
1014 {
1015         struct libinput_event **events = libinput->events;
1016         size_t events_len = libinput->events_len;
1017         size_t events_count = libinput->events_count;
1018         size_t move_len;
1019         size_t new_out;
1020
1021         events_count++;
1022         if (events_count > events_len) {
1023                 events_len *= 2;
1024                 events = realloc(events, events_len * sizeof *events);
1025                 if (!events) {
1026                         fprintf(stderr, "Failed to reallocate event ring "
1027                                 "buffer");
1028                         return;
1029                 }
1030
1031                 if (libinput->events_count > 0 && libinput->events_in == 0) {
1032                         libinput->events_in = libinput->events_len;
1033                 } else if (libinput->events_count > 0 &&
1034                            libinput->events_out >= libinput->events_in) {
1035                         move_len = libinput->events_len - libinput->events_out;
1036                         new_out = events_len - move_len;
1037                         memmove(events + new_out,
1038                                 events + libinput->events_out,
1039                                 move_len * sizeof *events);
1040                         libinput->events_out = new_out;
1041                 }
1042
1043                 libinput->events = events;
1044                 libinput->events_len = events_len;
1045         }
1046
1047         if (event->device)
1048                 libinput_device_ref(event->device);
1049
1050         libinput->events_count = events_count;
1051         events[libinput->events_in] = event;
1052         libinput->events_in = (libinput->events_in + 1) % libinput->events_len;
1053 }
1054
1055 LIBINPUT_EXPORT struct libinput_event *
1056 libinput_get_event(struct libinput *libinput)
1057 {
1058         struct libinput_event *event;
1059
1060         if (libinput->events_count == 0)
1061                 return NULL;
1062
1063         event = libinput->events[libinput->events_out];
1064         libinput->events_out =
1065                 (libinput->events_out + 1) % libinput->events_len;
1066         libinput->events_count--;
1067
1068         return event;
1069 }
1070
1071 LIBINPUT_EXPORT enum libinput_event_type
1072 libinput_next_event_type(struct libinput *libinput)
1073 {
1074         struct libinput_event *event;
1075
1076         if (libinput->events_count == 0)
1077                 return LIBINPUT_EVENT_NONE;
1078
1079         event = libinput->events[libinput->events_out];
1080         return event->type;
1081 }
1082
1083 LIBINPUT_EXPORT void *
1084 libinput_get_user_data(struct libinput *libinput)
1085 {
1086         return libinput->user_data;
1087 }
1088
1089 LIBINPUT_EXPORT int
1090 libinput_resume(struct libinput *libinput)
1091 {
1092         return libinput->interface_backend->resume(libinput);
1093 }
1094
1095 LIBINPUT_EXPORT void
1096 libinput_suspend(struct libinput *libinput)
1097 {
1098         libinput->interface_backend->suspend(libinput);
1099 }
1100
1101 LIBINPUT_EXPORT void
1102 libinput_device_set_user_data(struct libinput_device *device, void *user_data)
1103 {
1104         device->user_data = user_data;
1105 }
1106
1107 LIBINPUT_EXPORT void *
1108 libinput_device_get_user_data(struct libinput_device *device)
1109 {
1110         return device->user_data;
1111 }
1112
1113 LIBINPUT_EXPORT const char *
1114 libinput_device_get_sysname(struct libinput_device *device)
1115 {
1116         return evdev_device_get_sysname((struct evdev_device *) device);
1117 }
1118
1119 LIBINPUT_EXPORT const char *
1120 libinput_device_get_output_name(struct libinput_device *device)
1121 {
1122         return evdev_device_get_output((struct evdev_device *) device);
1123 }
1124
1125 LIBINPUT_EXPORT struct libinput_seat *
1126 libinput_device_get_seat(struct libinput_device *device)
1127 {
1128         return device->seat;
1129 }
1130
1131 LIBINPUT_EXPORT void
1132 libinput_device_led_update(struct libinput_device *device,
1133                            enum libinput_led leds)
1134 {
1135         evdev_device_led_update((struct evdev_device *) device, leds);
1136 }
1137
1138 LIBINPUT_EXPORT int
1139 libinput_device_get_keys(struct libinput_device *device,
1140                          char *keys, size_t size)
1141 {
1142         return evdev_device_get_keys((struct evdev_device *) device,
1143                                      keys,
1144                                      size);
1145 }
1146
1147 LIBINPUT_EXPORT void
1148 libinput_device_calibrate(struct libinput_device *device,
1149                           float calibration[6])
1150 {
1151         evdev_device_calibrate((struct evdev_device *) device, calibration);
1152 }
1153
1154 LIBINPUT_EXPORT int
1155 libinput_device_has_capability(struct libinput_device *device,
1156                                enum libinput_device_capability capability)
1157 {
1158         return evdev_device_has_capability((struct evdev_device *) device,
1159                                            capability);
1160 }
1161
1162 LIBINPUT_EXPORT struct libinput_event *
1163 libinput_event_device_notify_get_base_event(struct libinput_event_device_notify *event)
1164 {
1165         return &event->base;
1166 }
1167
1168 LIBINPUT_EXPORT struct libinput_event *
1169 libinput_event_keyboard_get_base_event(struct libinput_event_keyboard *event)
1170 {
1171         return &event->base;
1172 }
1173
1174 LIBINPUT_EXPORT struct libinput_event *
1175 libinput_event_pointer_get_base_event(struct libinput_event_pointer *event)
1176 {
1177         return &event->base;
1178 }
1179
1180 LIBINPUT_EXPORT struct libinput_event *
1181 libinput_event_touch_get_base_event(struct libinput_event_touch *event)
1182 {
1183         return &event->base;
1184 }